They were just making it the same as Dash (also no longer stacks with Cat Form). If I remember correctly, in Cataclysm the old Feline Swiftness and Stampeding Roar / Dash did stack, however boot enchant did not, as well as the fact that they rolled the old Feline Swiftness talent into Cat Form and gave us a new one that we can use as well. The end result is that if you're using both boot enchant and Feline Swiftness then you're going almost as fast as you were in Cataclysm anyway.

Close, in Cata, FS/Boot/SRoar/Dash were all of the same stacking line. This meant, only the highest of the 4 would be in in effect at any one time. So if you had fs and boot enchant, the boot would be doing nothing - and if you hit SRoar with FS, nothing happened (at the start of cata, they later buffed the speed boost so it would increase you to 60%).

Basically, during beta they unlinked all speed boosts, realized it was a horrible idea, and they relinked them back to the base cat form/travel form speed boost (except for boot speed, which now stacks).

I believe cata cat form base speed was about 130%, 149% in pvp - we go quite a bit faster now.